/*
 * Copyright (C) 2017-2019 Dremio Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Logical expression tree representation.
 *
 * Dremio manages expressions provided in many different parts of SQL queries.
 * This includes scalar expressions in select, filter and join conditions, as
 * well as aggregate and window functions. These expressions are represented
 * logically as ASTs during planning. The classes defined here provide the
 * different nodes in the expression tree, as well as utilities for building
 * and manipulating expressions during parsing and planning.
 *
 */
package com.dremio.common.expression;
